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Light emitting display apparatus

a technology of light-emitting display and display apparatus, which is applied in the direction of electrical apparatus, basic electric elements, semiconductor devices, etc., can solve the problems of waveguide loss, light among the light emitted from the light-emitting layer is confined in the light-emitting display apparatus, and the light extraction efficiency is reduced. , to achieve the effect of reducing surface plasmon loss and degrading light extraction efficiency

Active Publication Date: 2020-03-05
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention introduces a new structure for a light emitting display apparatus that reduces surface plasmon loss to improve the efficiency of light extraction. Additionally, the new structure also improves the outdoor visibility by reducing scattering reflectance in the off-state of the display apparatus.

Problems solved by technology

However, some of the light emitted from the light emitting layer may not be output to the outside of the light emitting display apparatus but may be confined inside the light emitting display apparatus so that the light extraction efficiency of the light emitting display apparatus becomes an issue.
For example, there is a problem in that some light among the light emitted from the light emitting layer is confined in the light emitting display apparatus due to a total reflection loss, a waveguide loss, and a surface plasmon loss.
The waveguide loss refers to degradation of light extraction efficiency due to the light confined therein because of the total reflection at the interface of components in the light emitting display apparatus.
The surface plasmon loss occurs when the light vibrates free electrons of the metal surface due to a phenomenon that light is absorbed onto a metal surface during a process of entering and propagating the light so that the light cannot be reflected or transmitted which degrades the light extraction efficiency.
In the meantime, the inventor of the present disclosure found out that when the light emitting device is formed to be uneven, there is a problem in that scattering reflectance in an off-state of the light emitting display apparatus is increased so that a visual feel in an off-state, that is, a black luminance can be degraded and thus not only the outdoor visibility, but also the contrast ratio can be degraded.

Method used

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Embodiment Construction

[0034]Advantages and characteristics of the present disclosure and a method of achieving the advantages and characteristics will be clear by referring to exemplary embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the exemplary embodiments disclosed herein but will be implemented in various forms. The exemplary embodiments are provided by way of example only so that those skilled in the art can fully understand the disclosures of the present disclosure and the scope of the present disclosure. Therefore, the present disclosure will be defined only by the scope of the appended claims.

[0035]The shapes, sizes, ratios, angles, numbers, and the like illustrated in the accompanying drawings for describing the exemplary embodiments of the present disclosure are merely examples, and the present disclosure is not limited thereto. Like reference numerals generally denote like elements throughout the specification. F...

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Abstract

A light emitting display apparatus includes a substrate which includes a first area and a second area, an insulating layer on the substrate and having an uneven surface, a first bank on the insulating layer in the second area and formed of a black material, a first electrode on the insulating layer in the first area where the first electrode covers at least a part of a side surface of the first bank, a light emitting layer on the first electrode, and a second electrode on the light emitting layer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority of Korean Patent Application No. 10-2018-0103245 filed on Aug. 31, 2018, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference into the present application.BACKGROUNDField[0002]The present disclosure relates to a light emitting display apparatus, and more particularly, to a light emitting display apparatus with an improved light extracting efficiency and an improved outdoor visibility.Description of the Related Art[0003]Currently, in a full-scale information era, a field of display apparatuses which visually express electrical information signals has been rapidly developed and studies have continued in order to improve performances of various display apparatuses such as thin-thickness, light weight, and low power consumption.[0004]Among various display apparatuses, a light emitting display apparatus is a self-emitting display apparatus where a separate ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L27/32
CPCH01L27/3246H01L27/3248H01L27/3258H10K59/122H10K59/8792H10K59/1213H10K59/124H10K59/878H10K59/80515H10K59/876H10K59/80521H01L27/156H01L33/10H01L33/36H01L33/20H01L27/1214H01L33/44H01L33/405H01L33/42H10K59/123
Inventor KIM, NAMSU
Owner LG DISPLAY CO LTD
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